Help. First Time Grower

This is my first time growing, the plants are doing well but there is this white stuff on the rockwool and i dont know where its coming from. I think its coming from the hydroton but im not sure. Can anyone help?

lol lol I believe you. your double posting.
ya really need a pic. would love to assist but heavens its
really hard to grow in the dark if ya know what I mean.

very good. thanks for the pic.
thats just a little bit o fungas. do you have good air circulation?
can happen with any warm wet medium.

email468 new equipment grow (PPP) - Marijuana Growing
okdoky I found your solution.
DO not mess up this fellers Journal its one of the best. he Puts Coco-Tech lid on top.
if you reade the entire journal latter on he says somthing about it.
I use soil mine can do that to. I just have to stir the dirt.

Thank You For The Info.